Length adjustment device for setting the length position of a tool, tool clamping device and system and method using the length adjustment device

Description

State of the art

[0001] The invention relates to a length adjustment device for at least one adjustment of a longitudinal position of a tool in a tool holder opening of a tool holder according to the preamble of claim 1, a tool clamping device according to claim 13, a system according to claim 14 and a method for one adjustment of a longitudinal position of a tool in a tool holder opening of a tool holder according to claim 15.

[0002] From the version of the universal setting and measuring device with integrated tool shrink system "redomatic" produced and distributed by E. ZOLLER GmbH & Co. KG setting and measuring devices prior to July 11, 2022, a length setting device for setting a longitudinal position of a tool in a tool holder opening is already known, with at least one interchangeable stop element for mechanically fixing the longitudinal position of the tool in the tool holder opening, with a longitudinally movable stop element for receiving the stop element, and with a coupling unit which is provided for a detachable coupling, in particular at least essentially free of backlash, between the stop element and the stop element along a longitudinal axis of the length setting device.

[0003] The object of the invention is, in particular, to provide a generic device with improved properties with regard to setting the longitudinal position of a tool in a tool holder opening, especially with regard to coupling length-adjustment pins with an axial drive in a length-adjustment device. This object is achieved according to the invention by the features of claims 1 and 13 to 15, while advantageous embodiments and further developments of the invention can be found in the dependent claims. Advantages / Disclosure of the Invention

[0004] The invention relates to a length adjustment device for setting a longitudinal position of a tool in a tool holder opening, with at least one interchangeable stop element for mechanically fixing the longitudinal position of the tool in the tool holder opening, with a longitudinally movable stop element for receiving the stop element, in particular by means of a receiving recess that partially receives the stop element or by means of a magnetic element that exerts an attractive magnetic force on the stop element, and with a coupling unit that is provided for a releasable coupling, in particular at least essentially free of backlash, between the stop element and the stop element along a longitudinal axis of the length adjustment device.

[0005] It is proposed that the coupling unit has an exchange position in which the stop element can be removed and inserted to establish or release the coupling between the stop element and the stop receiving element, and in particular a guide element which is at least intended to guide a longitudinal movement of the stop receiving element, and a fixing position in which the stop element and the stop receiving element, and in particular the guide element, are firmly coupled together, wherein the exchange position is fixed along the longitudinal axis and wherein the fixing position is displaceable along the longitudinal axis.

[0006] Advantages include the ability to easily and reliably change the stop element. A particularly quick change of the stop element is also advantageous. Tool-free replacement of the stop element is advantageous. The adjustable fixing position, which can be moved along the longitudinal axis, allows for particularly precise adjustment of the longitudinal direction.

[0007] Preferably, the length adjustment device is designed to retrofit an existing clamping system, particularly for standard universal spindles, which is why the installation space of the length adjustment device must have a diameter of less than 8 mm. In particular, increasing this installation space of the length adjustment device to more than 8 mm would require a large proportion of standard clamping systems to undergo complex and costly modifications.

[0008] Preferably, the length adjustment device should allow for a quick and / or easy, and in particular automated, change of stop elements, such as stop pins, e.g., for different tool holders. Preferably, several different stop elements are provided, in particular a set of seven different lengths and / or sizes, which are intended to be changed very frequently, in particular several times a day, during operation. Preferably, the length adjustment device is designed to be operated by a handling robot, which is at least intended to perform the change of the stop element automatically, in particular quickly and reliably.Preferably, the length adjustment device is designed to ensure a longitudinal position of a tool in a tool holder designed as a heat shrink chuck, with a deviation of less than 1 µm from a target longitudinal position, in particular a target length of the combination of shrunk-in tool and tool holder.

[0009] Preferably, the tool is designed as a shank tool, in particular as a machining tool, especially a milling and / or turning and / or other cutting tool, for use in a machine tool. Preferably, the tool is designed to form a connection, in particular a heat-shrink connection, with the tool holder. A "tool holder" is understood to mean, in particular, a component designed to hold a tool and connect the tool to a machine. In particular, the tool holder is designed as an interface between the tool and the machine. Preferably, the tool holder is designed as a tool chuck, in particular a shrink-fit chuck, preferably a heat-shrink chuck, or as a collet chuck, such as a hydraulic expansion collet chuck or a collet chuck.Preferably, the length adjustment device is designed to set a longitudinal position of the tool in the tool holder's opening, particularly with high precision (µm). Preferably, the longitudinal axis of the length adjustment device runs parallel to and / or coincides with the main extension direction of the stop element. Preferably, the longitudinal position, particularly in a given application and / or installation direction of the length adjustment device, is located above the length adjustment device in the direction of gravity. Preferably, the stop element limits and / or defines the longitudinal position. Preferably, the longitudinal position is arranged along the longitudinal axis, particularly as an extension of the longitudinal axis of the stop element, and / or parallel to the longitudinal axis of the stop element.The term "intended" is understood to mean, in particular, specifically programmed, designed, and / or equipped. The fact that an object is intended for a specific function is understood to mean, in particular, that the object fulfills and / or performs this specific function in at least one application and / or operating state. A "longitudinal position" is understood to mean, in particular, a position along the longitudinal axis of the length adjustment device, which is defined by a distance, especially between the stop mounting element and the tool holder. A "principal extension direction" of an object is understood to mean, in particular, a direction that runs parallel to the longest edge of the smallest geometric cuboid that just completely encloses the object.

[0010] In addition to heat-shrink chucks, the proposed length-setting device could also be used to adjust tool-tool chuck combinations where the shank tools are first adjusted and clamped linearly to length (using hydraulic expansion or collets). Before the length-setting process, a minimum quantity lubrication (MQL) screw is first turned all the way down (to allow for an axial adjustment stroke). After the length-setting process, the MQL screw is then turned back up so that it preferably rests against the shank end of a tool shank of the clamped tool. This is particularly advantageous because an air-oil mixture from the MQL screw can be advantageously transferred through a through-hole in the screw into any existing cooling channels in the tool.

[0011] Preferably, the stop element is designed as a pin and / or a bolt and / or a rod and / or a component with a comparable geometric shape. Preferably, the stop element has an outer contour that is at least substantially cylindrical, which is designed to guide the stop element during longitudinal movement. The stop element could, for example, be designed as a hollow profile or as a solid material. Preferably, the stop element is made of a metallic material and / or a plastic and / or glass. "Longitudinal movement" is understood to mean, in particular, movement along the longitudinal axis of the length adjustment device. Preferably, the stop element has different versions, in particular different lengths and / or different diameters. Preferably, the stop element is interchangeable. It is conceivable that the stop element has adjustable lengths and / or diameters.It is also conceivable that a receiving element has two or more ends for setting two or more independent longitudinal positions.

[0012] Preferably, the stop receiving element is designed as a hollow body, in particular a hollow profile and / or tube and / or as a cylinder with at least one recess, in particular a hole or blind hole. Alternatively, the stop receiving element can also be designed as a solid body, which provides a stop surface for the stop element. Preferably, the stop receiving element is made of a metallic material, in particular steel or aluminum. Preferably, the stop receiving element is designed to receive the stop element and / or to bear against the stop element and, in particular, to guide it perpendicular to the longitudinal direction. Preferably, the stop element is mounted to be movable in the longitudinal direction relative to the stop receiving element and / or along the longitudinal axis of the length adjustment device and / or to be rotatable about the longitudinal axis of the length adjustment device.Preferably, the stop element is movable at and / or above the changeover position relative to the stop receiving element, particularly along the longitudinal axis of the length adjustment device. Preferably, the stop element is fixedly connected to the stop receiving element at the fixing position, with the stop element and the stop receiving element arranged immovably relative to each other.

[0013] Preferably, a change of the stop element, in particular a relative movement of the stop element to the stop receiving element, is possible at the changeover position. Preferably, the coupling unit releases the stop element at the changeover position. Preferably, the stop element and the stop receiving element are rigidly coupled to each other and / or fixedly positioned relative to each other at every possible fixing position. "Rigidly coupled to each other" is understood to mean, in particular, a connection that cannot be separated without damage or that requires the release of a magnetic attachment. Preferably, the changeover position and the fixing position transition into one another, especially during a movement of the stop element along the longitudinal axis of the length adjustment device, when the coupling unit establishes a connection, in particular a positive-locking connection, between the stop element and the stop receiving element or the guide element.The term "form-fit" is understood to mean, in particular, that adjacent surfaces of components connected in a form-fit manner exert a holding force on each other acting in the normal direction of the surfaces. Specifically, the components are in geometric engagement with one another.

[0014] Furthermore, it is proposed that all possible fixing positions along the longitudinal axis be arranged completely below the changeover position. Advantageously, the force required to couple the stop element with the stop receiving element can be reduced. Advantageously, the stop element can be fixed by its own weight. Advantageously, the stop element cannot fall out during a faulty coupling process. Advantageously, a faulty coupling process can be prevented. The term "below" is understood to mean, in particular, a position which, especially with a given intended use and / or installation direction of the length adjustment device, is located in the direction of gravity.In particular, all possible fixing positions along an insertion direction in which a tool is inserted into a tool holder are located entirely below and / or behind the changeover position. Specifically, all possible fixing positions, viewed along the longitudinal direction, are further away from the tool holder than the changeover position. The term "coupling" is understood to mean, in particular, a process that connects and / or separates two separate components.

[0015] Furthermore, it is proposed that the coupling unit be designed to generate a positive-lock coupling between the stop element and the stop receiving element when the stop element is inserted into the stop receiving element along its longitudinal axis. Advantageously, the length and / or distance between the length adjustment device and the tool can be set with particular precision. Preferably, the positive-lock coupling and / or decoupling occurs automatically, especially when pressure and / or tension is applied to the stop element in the changeover position.

[0016] Alternatively, it is proposed that one of several possible fixing positions be arranged along the longitudinal axis in the same position as the changeover position. This advantageously allows for a compact design. In particular, the uppermost fixing position, preferably the one closest to a receiving opening of the guide element for the stop element, is the fixing position that is arranged in the same position as the changeover position. Specifically, all other fixing positions, which differ from the uppermost fixing position, are arranged entirely below the changeover position.

[0017] Furthermore, it is proposed that the length adjustment device includes a guide element which is designed to guide the longitudinal movement of the stop receiving element, wherein the coupling unit is designed to generate a coupling, particularly at least partially positive-locking, between the stop element and the guide element, especially at least in one direction along the longitudinal axis, preferably at least in one disengagement direction. This advantageously allows for secure fastening of the stop element. Advantageously, a maximum length setting of the stop element can be precisely determined. In particular, the coupling generated by the coupling unit between the stop element and the guide element is designed to prevent the stop element from being pulled out or removed from the length adjustment device, especially without causing damage.In particular, the coupling created by the coupling unit between the stop element and the guide element allows axial movement of the stop element between two endpoints. Specifically, the coupling created by the coupling unit between the stop element and the guide element prevents axial movement of the stop element beyond an upper endpoint. Specifically, the coupling created by the coupling unit between the stop element and the guide element prevents axial movement of the stop element beyond a lower endpoint. Preferably, the endpoints are formed by the guide element, in particular by edges of the guide element and / or by boundaries of a longitudinal recess / fixing recess incorporated into the guide element.

[0018] Furthermore, it is proposed that the coupling unit have a maximum transverse extent of at most 1.5 times, preferably at most 1.25 times, the maximum transverse extent of the stop element. Advantageously, the length adjustment device can be designed to be particularly compact. Advantageously, coupling can also be implemented in a particularly small / very limited installation space. Preferably, the transverse extent of the receiving element is at least substantially the same in all directions perpendicular to the main direction of extension. "Transverse extent" is understood to mean, in particular, an extent perpendicular to the main direction of extension of the stop receiving element and / or perpendicular to the longitudinal axis.

[0019] Furthermore, it is proposed that the coupling unit have a maximum transverse extent of no more than 8 mm. Advantageously, the length adjustment device can be designed to be particularly compact. Advantageously, coupling can also be implemented in a very small or severely restricted installation space. Advantageously, an existing structure can be retrofitted with the coupling unit.

[0020] Furthermore, it is proposed that the coupling unit has at least one positive locking element, designed separately from the stop element and the stop receiving element, which is at least intended to establish a positive connection for at least a partial positive locking coupling between the stop element and the stop receiving element. Advantageously, the coupling can be simplified. Advantageously, the stop element can be designed without a positive locking element. Advantageously, the stop element can be manufactured simply and cost-effectively. Preferably, during the coupling process, the positive locking element moves at least in the radial direction of the stop element.Preferably, a positive-locking connection for force transmission is provided between the stop element and the stop receiving element, particularly along the longitudinal axis of the length adjustment device, wherein the force transmission is formed by the positive-locking element engaging behind the stop element and the stop receiving element. Preferably, the positive-locking element is at least substantially free to move in the changeover position, particularly relative to the stop element and / or relative to the stop receiving element. "Separate" is understood to mean, in particular, a separate component. Specifically, the positive-locking element can be designed to be moved within the longitudinal recess / fixing recess of the guide element when the coupling unit is coupled.In particular, generating the movement of the positive locking element in the coupled state of the coupling unit requires overcoming a clamping force with which the positive locking element is clamped between the stop element and a locking element of the length adjustment device. Specifically, the positive locking element is pushed over a radially inner surface of the locking element. In particular, the positive locking element moves with the stop element, especially during a length adjustment process of the length adjustment device, particularly when the length is being adjusted.

[0021] Furthermore, it is proposed that the positive locking element be designed as a ball or a spring hook. Preferably, the ball is made of steel, glass, and / or ceramic. However, it is conceivable that the ball is made of plastic or a comparable material. Advantageously, the stop element can be guided with particularly high precision. Preferably, the spring hook is designed as a detent element, particularly a spring-elastic one. Preferably, the spring hook is made of a material with elastic properties, such as spring steel. Alternatively, an embodiment with a spring hook made of plastic and / or rubber would also be conceivable. Preferably, the positive locking element is designed to cause automatic release of the positive locking connection in the changeover position. It is also conceivable that the positive locking element is designed as a rotary lock, such as a bayonet lock.

[0022] Furthermore, it is proposed that the stop receiving element has at least one coupling recess for at least partially receiving the positive locking element, particularly in a coupled and in a decoupled state of the coupling unit. Advantageously, a coupling process can be performed automatically. Advantageously, a faulty coupling process can be prevented. Preferably, the at least one coupling recess is at least partially bounded by the stop receiving element, particularly circumferentially. Preferably, the at least one coupling recess of the stop receiving element is designed as a hole. The coupling recess of the rotatably mounted locking element, on the other hand, can be designed as a coupling trough, particularly as a non-through recess or as a closed recess. Preferably, the diameter of the coupling recess corresponds at least substantially to the diameter of the positive locking element, particularly the ball.Preferably, the number of coupling recesses corresponds to the number of positive locking elements.

[0023] Furthermore, it is proposed that the length adjustment device include a guide element designed to guide the stop element in a longitudinal and / or rotational movement. Advantageously, the longitudinal position can be set with particular precision. Preferably, the guide element is designed as a hollow body, in particular a hollow profile and / or a tube, designed to guide the stop element and / or the stop element along the longitudinal axis of the length adjustment device and, in particular, to limit movement of the stop element and / or the stop element perpendicular to its main direction of extension. Preferably, the guide element is rigidly connected to the length adjustment device, in particular by force-fit and / or positive locking.It is also conceivable that the guide element is formed integrally with the length adjustment device and / or that the guide element is formed as a recess, in particular as a hole / blind hole, in the length adjustment device. "Integral" is to be understood in particular as being at least materially bonded, for example by a welding process, an adhesive bonding process, an injection molding process and / or another process that would appear appropriate to a person skilled in the art, and / or advantageously formed in one piece, such as by manufacturing from a single casting and / or by manufacturing using a single- or multi-component injection molding process, and advantageously from a single blank.

[0024] Furthermore, it is proposed that the guide element has a fixing recess extending along the longitudinal axis, in which the positive locking element can be moved axially when the current fixing position is shifted. This advantageously allows for a simple and slidable fixing of the stop element. The locking element preferably covers the entire fixing recess radially outwards.

[0025] Furthermore, it is proposed that the guide element or the rotatably mounted locking element has a coupling recess, particularly a radially internal one, which allows the positive locking element to deflect at least temporarily, at least during coupling and / or decoupling of the stop element with the stop receiving element. Advantageously, the force required for coupling and / or decoupling can be reduced. Advantageously, a faulty coupling process can be prevented. Preferably, the coupling recess is formed as a recess that is at least partially bounded by the guide element. Preferably, the coupling recess is formed as a groove in the guide element, particularly one that circumferentially surrounds the longitudinal axis of the length adjustment device. Alternatively, the coupling recess is formed as a depression in the locking element that is approximately large enough to accommodate the positive locking element.Preferably, the coupling recess is open inwards in the radial direction of the guide element. Preferably, the coupling recess is designed to at least partially receive the at least one positive locking element during coupling and / or decoupling. Preferably, the temporary movement is limited at least substantially to the duration of the coupling and / or decoupling process. In particular, the coupling recess is fixed in its longitudinal position. The coupling recess of the locking element can be moved circumferentially by rotating the locking element. In particular, the stop receiving element is movably mounted relative to the coupling recess.

[0026] Furthermore, it is proposed that the coupling recess be designed to taper at least in one coupling direction, preferably parallel to the longitudinal direction, or at least in one circumferential direction. This advantageously prevents faulty coupling. In particular, the angle between the coupling recess tapering in the coupling direction and the longitudinal axis is less than 60°, advantageously less than 45°, and preferably less than 30°. Preferably, the coupling recess tapering in the coupling direction or circumferential direction is designed to enable, in particular, automatic closing of the positive-locking connection between the stop element and the stop receiving element.

[0027] Furthermore, it is proposed that the coupling recess be arranged in the rotatably mounted locking element such that it can be selectively brought into at least partial overlap with a fixing recess of the guide element by a rotational movement of the locking element. This advantageously allows for simple actuation of the coupling unit. It is conceivable that the rotatably mounted locking element is held or released manually or by an (external or internal) radial gripper, preferably pneumatically actuated, and then the overlap of the coupling recess with the fixing recess is adjusted by rotating the guide element. Alternatively, the gripper can also rotate the locking element directly. In particular, at most an upper end region of the fixing recess overlaps with the coupling recess.

[0028] Furthermore, a locking element is proposed that is mounted at least longitudinally in a receiving recess of the stop receiving element so as to be movable, or a locking element that is mounted rotatably around a guide element of the length adjustment device, wherein the guide element is at least designed to guide a longitudinal movement of the stop receiving element. Advantageously, the coupling process can be automatic. Preferably, the longitudinally movable locking element is formed as a bolt and / or a pin. Preferably, the rotatably mounted locking element is tubular or ring-shaped. Preferably, the rotatably mounted locking element circumferentially surrounds at least the guide element and / or at least the stop element in the coupled state. Preferably, the locking element is designed to actuate and / or enable the coupling process.Preferably, the movement of the longitudinally movable locking element is limited by the stop element perpendicular to the longitudinal axis of the length adjustment device. "Longitudinally movable" is understood to mean, in particular, movement along the longitudinal axis of the length adjustment device. Preferably, the movement of the rotatably mounted locking element is angularly limited by the guide element, for example, to approximately 150°. In particular, the locking element is designed separately from the stop element. In particular, the longitudinally movable locking element is designed to be in contact with an end region of a coupled stop element. In particular, the rotatably mounted locking element is arranged to be free of contact with the stop element in every operating state.

[0029] Furthermore, it is proposed that the locking element be designed to securely position the positive locking element in a decoupled state. This advantageously improves functionality. "Securely positioned" means, in particular, that the positive locking element remains in its position and, especially, does not fall out or become jammed against any of the adjacent components. Preferably, the locking element is designed to position the positive locking element in a decoupled state, particularly in the changeover position, and specifically to secure it against falling out. In particular, the locking element is designed to hold the positive locking element in the coupling recess and / or the coupling groove in the decoupled state.

[0030] It is proposed that the locking element incorporates a permanent magnet, which ensures the secure positioning of the positive locking element in the decoupled state. This advantageously achieves a high level of operational reliability. In particular, the positive locking element is made of a magnetic, especially ferromagnetic, material. Specifically, when the rotatably mounted locking element rotates, the positive locking element is released from the permanent magnet by contact with the guide element.

[0031] Furthermore, it is proposed that the locking element be designed to release the positive locking element for engagement with the stop element during a coupling process between the stop element and the stop receiving element, thus establishing at least partial positive locking coupling. Advantageously, this simplifies the coupling process. Preferably, the locking element is designed to move the positive locking element to open and / or close, particularly along the longitudinal axis or in the radial direction. Preferably, the locking element is designed to be actuated by the stop element, particularly along the longitudinal axis. In particular, the stop element is designed to further retract the locking element into the receiving recess of the stop receiving element or into the fixing recess of the guide element during the coupling process or in the already coupled state.In particular, the longitudinally movable locking element releases the form-locking element by deflecting / recessing the locking element into the receiving recess of the stop receiving element.

[0032] Furthermore, it is proposed that the length adjustment device include a return element which is designed, at least, to return the positive locking element, in particular by means of the locking element, and / or the stop receiving element to a ready-to-couple initial position during a decoupling process. Advantageously, functional reliability can be ensured. Preferably, the return element is designed as an elastically and / or viscoelastically deformable component. Preferably, a return movement is achieved by a, in particular elastic and / or viscoelastic, re-deformation of the return element. Preferably, a return force of the return element is at least substantially greater than the weight force of the locking element and / or the stop receiving element and at least substantially less than the weight force of the return element and / or the stop element.Preferably, the return movement is achieved by removing the weight force from the stop element. It is also conceivable that the return movement is achieved by a fluidic pressure, particularly pneumatic and / or hydraulic. In particular, the locking element positions the positive locking element securely in the ready-to-engage initial position.

[0033] Furthermore, it is proposed that the return element be designed as a compression spring supported at an end region of a receiving recess of the stop receiving element and / or a receiving recess of a base rod supporting the stop receiving element. Advantageously, the coupling mechanism can be improved. Preferably, the receiving recess is formed as a hole and / or a recess that is completely bounded and / or closed at least perpendicular to the longitudinal axis by the stop receiving element / base rod. Preferably, the compression spring is designed as a helical compression spring and / or a disc spring and / or an elastically deformable rubber element. An "end region" is understood to mean, in particular, a region which, in a decoupled state, is located on a side opposite the coupling element, wherein the end region is arranged at a maximum distance between the receiving recess and the coupling element.

[0034] Furthermore, it is proposed that the stop element has at least one engagement recess, which is designed to engage with the positive locking element to establish the positive locking connection between the stop element and the stop receiving element or the guide element. Advantageously, a stable connection can be ensured. Preferably, the engagement recess corresponds at least substantially to the negative shape of the positive locking element. Preferably, the engagement recess represents a positive locking element corresponding to the positive locking element. Preferably, the stop receiving element has the same number of engagement recesses as positive locking elements. In an alternative embodiment, the engagement recess could be formed circumferentially around the stop element. Preferably, the stop element defines the coupling recess and / or coupling recesses.

[0035] Furthermore, it is proposed that the stop element has at least one additional positive locking element, which is designed to receive a torque from the stop receiving element and / or transmit it to the stop receiving element. Advantageously, a fault-free coupling process can be achieved. Preferably, the additional positive locking element is designed to form a positive connection with a corresponding additional positive locking element of the stop receiving element. Preferably, the additional positive locking element is designed as an external hexagon. Preferably, the corresponding additional positive locking element of the stop receiving element is designed as an internal hexagon. It is conceivable that the positive locking element is designed as a triangular, square, polygonal, or similar element designed to produce a positive locking connection.

[0036] Another possible application of the length adjustment device involves adjusting tool lengths solely via adjusting or MMS screws on chucks. In this case, only the rotational function of the length adjustment device is used to facilitate the insertion of the pin into the internal hexagon of an adjusting or MMS screw of the corresponding tool holder. Advantageously, the length adjustment device acts as a kind of universal tool for virtually all tool length adjustment methods known in industry, particularly via a single interface. By designing the corresponding positive locking element of the stop mounting element as an internal hexagon (Allen key), a relatively large degree of freedom in positioning for changing stop elements and the transmission of a relatively high torque are advantageously achieved.

[0037] Furthermore, it is proposed that the stop element have a ball cap on its end facing the stop receiving element. This advantageously simplifies assembly. Preferably, the ball cap is designed to facilitate the insertion of the stop element into the stop receiving element. It would also be conceivable for the ball cap to be designed as a cone and / or as a step, particularly a stepped one, and / or as a chamfer.

[0038] Furthermore, it is proposed that the stop receiving element and / or a base rod supporting the stop receiving element be mounted for rotational movement. Advantageously, this simplifies the coupling process between the stop element and the stop receiving element. Preferably, the rotational movement is provided to simplify coupling, in particular the creation of the positive-locking connection between the positive-locking element and the engagement recess.

[0039] Furthermore, a tool clamping device, in particular a shrink-fit clamping device, with a length adjustment mechanism is proposed. Advantageously, this allows for particularly precise positioning of the tool in the tool holder. Specifically, the shrink-fit clamping device includes at least one induction heating unit for the temporary thermal expansion of a tool holder opening.

[0040] Furthermore, a system comprising a tool clamping device and a handling robot is proposed, whereby the handling robot is designed for the automated exchange of the stop element, particularly by means of a purely linear movement. This can advantageously reduce costs. Alternatively, it is also conceivable that the exchange of the stop element could be carried out manually, particularly by hand by a person.

[0041] Furthermore, a method for coupling a stop element with a stop receiving element in a length adjustment device is proposed, wherein the stop element and the stop receiving element are coupled in a single coupling step at a fixed exchange position located above all fixing positions in which the stop element and the stop receiving element are permanently and non-destructively connected to one another. Advantageously, a particularly fast exchange of the stop element can be achieved. Advantageously, the exchange of the stop element can be performed without tools.

[0042] Alternatively, it is proposed that the stop element and the stop receiving element be coupled in a single coupling step at a fixed changeover position, which is axially equivalent to one of several different fixing positions. In these positions, the stop element and the guide element, which is at least intended to guide the longitudinal movement of the stop receiving element, are inseparably and non-destructively connected. Advantageously, this can enable reliable and / or precise length adjustment.

[0043] The length adjustment device, tool clamping device, system, and method according to the invention are not limited to the application and embodiment described above. In particular, the length adjustment device, tool clamping device, system, and method according to the invention may, to achieve a functionality described herein, comprise a different number of individual elements, components, units, and process steps than those specified herein. Furthermore, values ​​within the specified limits of the value ranges stated in this disclosure are also considered disclosed and freely usable. Drawings

[0044] Further advantages become apparent from the following description of the drawings. The drawings illustrate three exemplary embodiments of the invention. The drawings, the description, and the claims contain numerous features in combination.

[0045] They show: Fig. 1 a schematic perspective view of a system with a tool clamping device having a length adjustment device and with a handling robot, Fig. 2 a schematic vertical sectional view of the length adjustment device in the coupled state, Fig. 3 a schematic vertical sectional view of the length adjustment device in the decoupled state, Fig. 4 a schematic flowchart of a method for coupling a stop element of the length adjustment device with a stop receiving element of the length adjustment device, Fig. 5 a schematic longitudinal sectional view of an alternative embodiment of a length adjustment device with spring hooks, Fig. 6 schematic transverse sectional views of the alternative embodiment of the length adjustment device with spring hooks, Fig.Fig. 7 a schematic vertical sectional view of another alternative length adjustment device in a coupled state (stop element locked), Fig. 8 the schematic vertical sectional view of the other alternative length adjustment device in the coupled state at another fixing position (stop element locked), Fig. 9 a schematic vertical sectional view of the other alternative length adjustment device in a decoupled state (stop element released), Fig. 10 a schematic sectional view in the transverse direction of the other alternative embodiment of the length adjustment device along the . Fig. 7 indicated section axis I and Fig. 11 show a schematic sectional view in the transverse direction of the further alternative embodiment of the length adjustment device along the axis shown in the Fig. 7 indicated intersection axis II. Description of the exemplary implementations

[0046] The Figure 1Figure 78a shows a system with a tool clamping device 78a. The tool clamping device 78a is shown as an example of a shrink-fit clamping device. The tool clamping device 78a has a length adjustment device 72a. The length adjustment device 72a is designed for setting a longitudinal position 18a of a tool 10a, designed as a shank tool, in a tool holder opening 12a of a tool holder 14a, designed as an example of a heat-shrink chuck, during a heat-shrinking process. In this case, the heat-shrink chuck is designed as an induction heat-shrink chuck. The tool clamping device 78a has an induction coil 86a. The induction coil 86a is designed to heat the tool holder 14a. The tool clamping device 78a has a tower 82a. The tower 82a has a rail 88a. The induction coil 86a is movable in the rail 88a in the vertical direction for heating the tool holder 14a. The system features a base frame 84a.The length adjustment device 72a is arranged on the base frame 84a. The system includes a drive unit 76a. The drive unit 76a moves a stop element 16a of the length adjustment device 72a in a vertical direction (see, among others, ). Fig. 2 The drive unit 76a is designed to adjust a longitudinal position 18a of a stop element 16a within the tool holder 14a (see, among others, the following). Fig. 2 The system includes a handling robot 66a. The handling robot 66a is designed for the automated changing of the stop element 16a, in particular by means of a purely linear movement. It is also conceivable that the tool change could be carried out manually.

[0047] The Figure 2Figure 1 shows a schematic cross-section through a part of a length-adjusting device 72a. The length-adjusting device 72a is shown in a coupled state 70a. The length-adjusting device 72a has an interchangeable stop element 16a. The stop element 16a is designed to mechanically fix the longitudinal position 18a of the tool 10a in the tool holder opening 12a. The stop element 16a forms a stop for the lower end of a shank of the tool 10a, which is inserted into the tool holder opening 12a during a heat-shrinking process. The length-adjusting device 72a is designed to move the stop element 16a into a desired / intended position within the tool holder opening 12a of the tool holder 14a. The stop element 16a is rod-shaped. The stop element 16a has a cylindrical outer contour.Preferably, an outer contour of at least one upper end region of the stop element 16a corresponds approximately to an inner contour of the tool-holding opening 12a of the tool holder 14a. The diameter of the cylindrical outer contour of the stop element 16a is much smaller than the length of the stop element 16a. The stop element 16a could also have an angular outer contour. The stop element 16a could, for example, be triangular or square. The stop element 16a is made of a hard material, in particular one that is at least substantially non-elastically deformable. By moving the stop-holding element 20a along a longitudinal direction, the stop element 16a can be lowered into the tool-holding opening 12a.

[0048] The length adjustment device 72a has a stop receiving element 20a. The stop receiving element 20a is mounted for longitudinal movement. The stop receiving element 20a is mounted for rotation. The stop receiving element 20a is designed to receive the stop element 16a. The stop receiving element 20a is designed to be coupled with the stop element 16a. In the coupled state 70a, the stop element 16a and the stop receiving element 20a are constrained by movement. In a decoupled state 68a (see Figure 70a), the stop element 16a and the stop receiving element 20a are not constrained by movement. Fig. 3The stop element 16a and the stop receiving element 20a are movable relative to each other and / or rotatable relative to each other. The stop receiving element 20a has a receiving recess 42a. The receiving recess 42a is designed to at least partially receive the stop element 16a. The receiving recess 42a is located centrally in the stop receiving element 20a. The receiving recess 42a is designed as a hole in the stop receiving element 20a. The receiving recess 42a is designed as a blind hole. The receiving recess 42a could, for example, also be designed as a through hole. The receiving recess 42a in the stop receiving element 20a extends in a longitudinal direction of the stop receiving element 20a. The geometric shape of the receiving recess 42a corresponds to the geometric shape of an end region 48a of the stop element 16a. The stop receiving element 20a has a chamfer 74a.The chamfer 74a is designed to simplify the insertion of the stop element 16a into the stop receiving element 20a. The stop receiving element 20a is made of a hard material, in particular one that is at least substantially non-elastically deformable. The stop receiving element 20a is movable by a drive mechanism. The stop receiving element 20a is longitudinally movable by a drive mechanism. The stop receiving element 20a is rotatable by a drive mechanism. The tool clamping device 78a has a drive unit 76a (see . . Fig. 1 ) which is designed to move the stop receiving element 20a in the longitudinal direction and / or to rotate it about its longitudinal axis 28a.

[0049] The length adjustment device 72a has a coupling unit 22a. The coupling unit 22a is designed for a backlash-free coupling between the stop element 16a and the stop receiving element 20a along the longitudinal axis 28a of the length adjustment device 72a. The coupling unit 22a is designed for a detachable coupling between the stop element 16a and the stop receiving element 20a along a longitudinal axis 28a of the length adjustment device 72a. The coupling unit 22a is designed to create a positive-lock coupling between the stop element 16a and the stop receiving element 20a when the stop element 16a is inserted into the stop receiving element 20a along the longitudinal axis 28a.

[0050] The coupling unit 22a forms a changeover position 24a (see Fig. 3In the changeover position 24a, the stop element 16a protrudes from the top of the tool holder opening 12a. The coupling unit 22a forms exactly one changeover position 24a along the longitudinal axis 28a. In the changeover position 24a, the stop element 16a can be removed from the tool holder 14a and / or from the stop mounting element 20a. In the changeover position 24a, the stop element 16a can be inserted into the tool holder 14a and / or into the stop mounting element 20a. The changeover position 24a is intended for establishing or releasing the coupling between the stop element 16a and the stop mounting element 20a. The coupling unit 22a has positive locking elements 32a. In the changeover position 24a, the positive locking elements 32a can move radially away from the stop mounting element 20a. The deflection of the positive locking elements 32a is intended to release the stop element 16a. The changeover position 24a is fixed along the longitudinal axis 28a.The coupling unit 22a forms a fixing position 26a (see . Fig. 2 The coupling unit 22a forms a plurality of fixing positions 26a along the longitudinal axis 28a. In the fixing position 26a, the stop element 16a and the stop receiving element 20a are rigidly coupled to each other (rotationally and translationally). In the fixing position 26a, no radial movement of the positive locking elements 32a relative to the stop receiving element 20a is possible. The fixing position 26a is displaceable along the longitudinal axis 28a. All possible fixing positions 26a along the longitudinal axis 28a are (viewed from the tool holder 14a) arranged completely below the changeover position 24a.

[0051] The coupling unit 22a has a maximum transverse extent 30a of at most 1.25 times the maximum transverse extent 80a of the stop element 16a. It is also conceivable that the coupling unit 22a has a maximum transverse extent 30a of at most 1.5 times the maximum transverse extent 80a of the stop element 16a. The coupling unit 22a has a maximum transverse extent 30a of at most 8 mm. The coupling unit 22a has several positive locking elements 32a, which are formed separately from the stop element 16a and separately from the stop receiving element 20a. The positive locking elements 32a are designed as spheres. The positive locking element 32a is intended to establish the positive locking connection for the positive locking coupling between the stop element 16a and the stop receiving element 20a.

[0052] The Figure 3Figure 72a shows the length adjustment device 72a in a decoupled state 68a. The coupling unit 22a of the length adjustment device 72a is shown in the changeover position 24a. The stop receiving element 20a has coupling recesses 34a. The coupling recesses 34a are each for the partial reception of one of the positive locking elements 32a in a coupled state 70a (see Figure 70a). Fig. 2 ) and in a decoupled state 68a (see Fig. 3The coupling unit 22a is provided. The stop receiving element 20a has exactly the same number of coupling recesses 34a as positive locking elements 32a. The stop receiving element 20a could have more coupling recesses 34a than positive locking elements 32a. The stop receiving element 20a has coupling recesses 34a corresponding to the positive locking element 32a. The coupling recesses 34a are designed as round through holes extending radially in the stop receiving element 20a. The diameters of the coupling recesses 34a correspond approximately to the diameters of the respective associated positive locking elements 32a.

[0053] The length adjustment device 72a has a guide element 36a. The guide element 36a is designed as a hollow body. The guide element 36a is designed as a sleeve. The inner diameter of the guide element 36a corresponds approximately to the outer diameter of the stop receiving element 20a. The guide element 36a has a round outer contour. The outer contour could also be angular. The guide element 36a has a round inner contour. The outer diameter of the guide element 36a is much smaller than the length of the guide element 36a. The guide element 36a is rotationally symmetrical. The maximum transverse extent 30a of the coupling unit 22a extends to the outer diameter of the guide element 36a. The guide element 36a is made of a metallic material. The guide element 36a is made of the same material as the stop element 16a.The guide element 36a is made of the same material as the stop mounting element 20a. The guide element 36a is fixedly installed in the tool clamping device 78a. The guide element 36a is rigidly connected to the tool clamping device 78a. The guide element 36a is pressed into a recess of the tool clamping device 78a as a sleeve. The guide element 36a could be designed as a bore. The stop mounting element 20a is inserted into the guide element 36a. The stop mounting element 20a is rotatably and / or translationally movable within the guide element 36a. The guide element 36a is designed to guide a longitudinal movement and / or a rotational movement of the stop mounting element 20a. The guide element 36a has a radially internal coupling recess 38a.The coupling recess 38a allows at least temporary movement of the positive-locking element 32a during coupling and / or decoupling of the stop element 16a with the stop receiving element 20a. The coupling recess 38a extends around the circumference of the guide element 36a. In the coupling unit 22a's changeover position, the coupling recess 38a is located at the level of the coupling recesses 24a / overlapping the coupling recesses 24a. In the coupling unit 22a's fixed position, the coupling recess 38a is located above the coupling recesses 24a. The coupling recess 38a is self-contained. The coupling recess 38a is asymmetrical along the longitudinal axis 28a. The coupling recess 38a tapers obliquely in the coupling direction 40a. The sloping coupling recess 38a is designed to ensure that the positive locking elements 32a move along the longitudinal axis 28a during coupling and uncoupling.The positive locking elements 32a are at least partially arranged in the coupling recess 38a in the decoupled state 68a.

[0054] The length adjustment device 72a has a locking element 44a. The locking element 44a has a cylindrical shape. The locking element 44a is rotationally symmetrical. The locking element 44a is longitudinally movable in the receiving recess 42a of the stop receiving element 20a. The locking element 44a is rotatably mounted in the stop receiving element 20a. The locking element 44a is designed to position the positive locking elements 32a securely in a decoupled state 68a. The locking element 44a is designed to release the positive locking element 32a for engagement with the stop element 16a during a coupling process between the stop element 16a and the stop receiving element 20a, thus establishing the positive locking coupling. The locking element 44a is designed to be actuated by the stop element 16a.The positive locking elements 36a are arranged in the decoupled state 68a between the guide element 36a and the locking element 44a. The positive locking elements 32a are arranged in the coupled state 70a between the guide element 36a and the stop element 16a.

[0055] The length adjustment device 72a has a return element 46a. The return element 46a is designed to return the positive locking element 32a, in particular by means of the locking element 44a, to a ready-to-couple initial position during a decoupling process. The ready-to-couple initial position corresponds to the coupled state 70a. The return element 46a is designed as a compression spring. The compression spring is supported at an end region 48a of the receiving recess 42a of the stop receiving element 20a. The spring force of the compression spring is greater than the weight of the locking element 44a. It is also conceivable that the return movement is effected by a fluidic pressure, in particular pneumatic and / or hydraulic pressure.

[0056] The stop element 16a has an engagement recess 50a. The engagement recess 50a is designed to engage with the positive locking element 32a to create the positive locking connection between the stop element 16a and the stop receiving element 20a. The stop element 16a has a further positive locking element 52a. The further positive locking element 52a is designed to receive a torque from the stop receiving element 20a and / or to transmit it to the stop receiving element 20a. The further positive locking element 52a is designed as a polygon, e.g., an external hexagon. The stop element 16a has a ball cap 54a. The ball cap 54a is arranged at an end of the stop element 16a facing the stop receiving element 20a. The stop receiving element 20a is mounted for rotational movement.

[0057] The Figure 4shows a schematic flowchart of a procedure for coupling the stop element 16a with the stop receiving element 20a.

[0058] In process step 56a, the stop element 16a is removed or inserted along the longitudinal axis 28a to establish or release the coupling between the stop element 16a and the stop receiving element 20a in a change position 24a of the coupling unit 22a. The insertion of the stop element 16a into the stop receiving element 20a is carried out by a handling robot 66a. Alternatively, the insertion of the stop element 16a into the stop receiving element 20a can also be carried out manually. During the entire insertion process, the stop receiving element 20a is rotated about the longitudinal axis 28a.

[0059] In a further process step 58a, the stop element 16a is moved downwards along the length adjustment device 72a at the changeover position 24a of the coupling unit 22a. The changeover position 24a is fixed along the longitudinal axis 28a. The changeover position 24a is located above all fixing positions 26a. The positive locking element 32a is pressed radially inwards by the downwardly sloping coupling recess 38a. The positive locking element 32a is inserted into the coupling recess 34a. The positive locking connection between the stop element 16a and the stop receiving element 20a is established by the inwardly pressed positive locking element 32a. The stop element 16a and the stop receiving element 20a are coupled at the fixed changeover position 24a in a coupling step (process step 58a). The stop element 16a and the stop receiving element 20a are firmly coupled together.The fixing positions, 26a, the stop element 16a and the stop receiving element 20a are inseparably connected to each other without damage.

[0060] In a further process step 60a, the stop-receiving element 20a, connected to the stop element 16a, is moved upwards and downwards during the length adjustment movement of the tool 10a. The stop element 16a and the stop-receiving element 20a are moved in a fixing position 26a along the longitudinal axis 28a to achieve a length adjustment.

[0061] In a further process step 62a, the stop element 16a is moved upwards along the longitudinal axis 28a until the change position 24a is reached with the coupling unit 22a.

[0062] In a further process step 64a, the stop element 16a is moved upwards. This causes the positive locking elements 32a to move radially outwards and the positive locking connection is released.

[0063] In the Figures 5 to 11 Further embodiments of the invention are shown. The following description and the drawing are essentially limited to the differences between the embodiments, whereby with regard to identically designated components, in particular with regard to components with the same reference numerals, reference is also generally made to the drawings and / or the description of the other embodiment, in particular the Figures 1 to 4 , can be referenced. To distinguish the embodiments, the letter a is the reference numeral of the embodiment in the Figures 1 to 4 recreated. In the exemplary embodiment of the Figures 5 to 11 The letter a is replaced by the letters b and c.

[0064] The Figure 5Figure 1 shows a schematic sectional view of an alternative embodiment of a length adjustment device 72b. The length adjustment device 72b is shown in the coupled state 70b. The length adjustment device 72a has a stop element 16b. The length adjustment device 72b has a stop receiving element 20b. The stop receiving element 20b has a coupling recess 34b. The stop receiving element 20b has a receiving recess 42b. The stop element 16b is arranged in the receiving recess 42b of the stop receiving element 20b. The length adjustment device 72a has a guide element 36b. The guide element 36b has a coupling recess 38b. The coupling recess 38b is circumferential. The stop receiving element 20b is arranged in the guide element 36b. The stop element 16b is arranged in the guide element 36b. The length adjustment device 72b has a coupling unit 22b.The coupling unit 22b has a positive locking element 32b. The positive locking element 32b is designed as a spring hook. The spring hook forms a positive locking connection with the stop element 16b, cf. . Fig. 5 The spring hook, in coupled state 70b, extends through the coupling recess 34b. In coupled state, the spring hook is under tension. In coupled state 70b, the spring hook is elastically deformed. The coupling recess 34b is rectangular. The coupling recess 38b is designed to receive the spring hook when the stop element 16b is decoupled from the stop receiving element 20b. The positive locking element 32b, shown with dashed lines, represents the decoupled state 68b of the positive locking element 32b.

[0065] The Figure 6Figure 1 shows a sectional view of a section in the transverse direction of the length adjustment device 72b. The length adjustment device 72b has a guide element 36b. The length adjustment device 72b has a stop receiving element 20b. The stop receiving element 20b is arranged in the guide element 36b. The stop receiving element 20b is mounted in the guide element 36b so as to be longitudinally and / or rotationally movable. The length adjustment device 72b has a stop element 16b. The stop element 16b is arranged in the stop receiving element 20b. The stop element 16b has a further positive locking element 52b. The further positive locking element 52b is designed as an external hexagon. The stop receiving element 20b has an internal hexagon. The stop element 16b and the stop receiving element 20b form a positive locking connection. The length adjustment device 72b has a coupling unit 22b.The coupling unit 22b is shown in the coupled state 70b. The coupling unit 22b has a positive locking element 32b. The coupling unit 22b has a coupling recess 34b. The positive locking element 32b engages in the coupling recess 34b. The coupling recess 34b has the same geometric shape as the positive locking element 32b.

[0066] The guide element 36b has a coupling recess 38b. The coupling recess 38b is designed to receive the positive locking element 32b in a decoupled state 68b.

[0067] The Figure 7Figure 1 shows a schematic vertical sectional view of a part of another alternative length adjustment device 72c. The other alternative length adjustment device 72c is shown in a coupled state 70c. The other alternative length adjustment device 72c has an interchangeable stop element 16c. The stop element 16c is made of a magnetic material, for example, magnetic steel. The length adjustment device 72c has a stop receiving element 20c. The stop receiving element 20c is mounted for longitudinal movement. The stop receiving element 20c is mounted for rotation. The stop receiving element 20c forms a stop for the stop element 16c. The stop receiving element 20c is designed for coupling with the stop element 16c. The stop receiving element 20c has a magnetic element 94c. The stop receiving element 20c is designed for magnetic coupling with the stop element 16c.The magnetic element 94c of the stop-receiving element 20c exerts a magnetic attraction force on the stop element 16c. Due to the coupling, the stop-receiving element 20c and the stop element 16c can only be moved together in the coupled state 70c. In the coupled state 70c, the stop element 16c and the stop-receiving element 20c are constrained to move independently. In a decoupled state 68c, however (see... Fig. 9The stop element 16c and the stop receiving element 20c are movable relative to each other and / or rotatable relative to each other. In this embodiment, the stop receiving element 20c is designed without a receiving recess for receiving the stop element 16c. The stop receiving element 20c is longitudinally movable by a drive mechanism. The further alternative length adjustment device 72c has a base rod 92c. The base rod 92c is mounted for rotational movement. The base rod 92c has a pin 102c. The pin 102c is mounted for longitudinal movement. The stop receiving element 20c rests against the pin 102c of the base rod 92c. The base rod 92c, in particular the pin 102c of the base rod 92c, supports the stop receiving element 20c. The pin 102c of the base rod 92c is designed to transmit / exert a longitudinal movement on the stop receiving element 20c and thus, in the coupled state 70c, also on the stop element 16c.The pin 102c of the base rod 92c moves the stop mounting element 20c up and down in a recess of the length adjustment device 72c which supports the stop mounting element 20c. A tool clamping device 78c comprising the length adjustment device 72c has a drive unit 76c (see also ). Fig. 1 ) which is at least intended to move the pin 102c of the base rod 92c in a longitudinal direction.

[0068] The length adjustment device 72c has a coupling unit 22c. The length adjustment device 72c has a guide element 36c. The guide element 36c is designed to guide the stop element 16c during the coupling or uncoupling process or during length adjustment. The guide element 36c is designed as a hollow body. The guide element 36c is fixedly installed in the tool clamping device 78c. The stop receiving element 20c is inserted into the guide element 36c. The stop receiving element 20c is translationally movable within the guide element 36c. The guide element 36c is designed to guide a longitudinal movement of the stop receiving element 20c. The coupling unit 22c is designed for a detachable coupling between the stop element 16c and the guide element 36c. The coupling unit 22c is designed for a detachable coupling between the stop element 16c and the guide element 36c, at least in the radial direction.The coupling unit 22c is designed to create a partial positive-lock coupling between the stop element 16c and the guide element 36c. The guide element 36c is designed to receive the stop element 16c. The guide element 36c has an insertion opening 106c into which the stop element 16c can be inserted. The insertion opening 106c includes an internal hexagon socket. The insertion opening 106c has an insertion chamfer 108c to facilitate the insertion of the stop element 16c.

[0069] The coupling unit 22c forms a changeover position 24c (see Fig. 9The coupling unit 22c forms exactly one changeover position 24c along a longitudinal axis 28c of the length adjustment device 72c. In changeover position 24c, the stop element 16c can be removed, particularly without significant force and without damage. The stop element 16c can also be inserted in changeover position 24c, particularly without significant force and without damage. Changeover position 24c is provided for establishing or releasing the coupling between the stop element 16c and the guide element 36c. Changeover position 24c is fixed along the longitudinal axis 28c. The coupling unit 22c has a positive locking element 32c. The positive locking element 32c is designed as a ball. The positive locking element 32c is designed to establish a partially positive locking connection between the stop element 16c and the guide element 36c. In the changeover position 24c, the positive locking element 32c can be moved radially to the stop element 16c.to an opening, in particular of the guide element 36c, which receives the stop element 16c in the coupled state 70c. The displacement of the positive locking elements 32c is intended to release the stop element 16c. The guide element 36c has a fixing recess 96c. The fixing recess 96c extends along the longitudinal axis 28c.

[0070] The coupling unit 22c forms a first fixing position 26c (see Fig. 7 The coupling unit 22c forms a second fixing position 26'c (see Fig. 8The coupling unit 22c forms a plurality of fixing positions 26c along the longitudinal axis 28c. In the fixing positions 26c, 26'c, the stop element 16c and the stop receiving element 20c are translationally fixed to each other. The fixing positions 26c, 26'c are displaceable along the longitudinal axis 28c. All possible fixing positions 26'c, with the exception of the first fixing position 26c along the longitudinal axis 28c, are (viewed from the tool holder 14c) arranged completely below the changeover position 24c. The first fixing position 26c is located in the same position as the changeover position 24c. In the fixing positions 26c, no movement of the positive locking element 32c radially to the stop element 16c or to a receiving recess 90c of the base rod 92c that receives the stop element 16c in the coupled state 70c is possible.

[0071] The length adjustment device 72c has a locking element 44c. The locking element 44c is tubular / ring-shaped. The locking element 44c engages the guide element 36c at its outer circumference. The locking element 44c is rotatably mounted. The locking element 44c is rotatably mounted around the guide element 36c. The locking element 44c is accessible at its outer circumference for a robot or an operator. The locking element 44c is fixed along its longitudinal axis 28c. The locking element 44c is designed to securely position the positive locking element 32c in a decoupled state 68c of the length adjustment device 72c.The locking element 44c is designed to release the positive locking element 32c for engagement with the stop element 16c to establish partial positive locking during a coupling process between the stop element 16c and the guide element 36c / during a fixation of the stop element 16c in the length adjustment device 72c. The locking element 44c is designed to be actuated externally.

[0072] The locking element 44c has a radially internal coupling recess 38c. The coupling recess 38c allows at least temporary movement of the positive locking element 32c during coupling and / or decoupling of the stop element 16c. The coupling recess 38c is located at the level of the coupling recesses 24c. The coupling recess 38c is arranged in the rotatably mounted locking element 44c such that, by a rotational movement of the locking element 44c, it can be selectively brought into at least partial overlap with the fixing recess 96c of the guide element 36c (see Figure 1). Fig. 9 ) can be brought out of overlap with the fixing recess 96c (cf. Fig. 7 or 8The coupling recess 38c is located above the positive locking element 34c in all fixing positions 26'c except the first fixing position 26c. The coupling recess 38a is asymmetrically designed along a circumferential direction 98c of the locking element 44c. The coupling recess 38c is tapered in the circumferential direction 98c. The tapered coupling recess 38c is designed to ensure that the positive locking elements 32c move radially when the stop element 16c is engaged or disengaged. The positive locking elements 32c are only at least partially located in the coupling recess 38c in the decoupled state 68c. The locking element 44c has a permanent magnet element 100c. The permanent magnet element 100c is designed to ensure the positive locking element 32c is held securely in the decoupled state 68c. The permanent magnet element 100c is arranged in the coupling recess 38c.The permanent magnet element 100c is arranged on an inner wall of the coupling recess 38c or at least partially forms it. The positive locking element 32c is designed as a magnetic sphere, e.g., a magnetic steel sphere, which can interact magnetically with the permanent magnet element 100c, and in particular is magnetically attracted to it.

[0073] The length adjustment device 72c has a return element 46c. The return element 46c is designed to return the stop-receiving element 20c to a ready-to-couple initial position during a decoupling process. The stop-receiving element 20c forms a spring-loaded pressure piece supported against the return element 46c. The return element 46c is designed to return the stop-receiving element 20c to its uppermost position in the decoupled state 68c, as described in the Fig. 9As shown. A displacement of the stop element 16c from the first fixing position 26c to one of the further fixing positions 26'c causes the return element 46c to be clamped and / or the stop receiving element 20c to be inserted into the receiving recess 90c of the base rod 92c (see figure). Fig. 8 The return element 46c is designed as a compression spring. The compression spring is supported at an end region 48c of the receiving recess 90c of the base rod 92c. The compression spring is supported at the stop receiving element 20c.

[0074] In the Figure 7 and 8 In cases where the coupling recess 38c of the locking element 44c does not overlap with the fixing recess 96c of the guide element 36c, the locking element 44c is shown in a different rotational position than in the Figure 9 , in which the coupling recess 38c of the locking element 44c overlaps with the fixing recess 96c of the guide element 36c.

[0075] The Figure 10shows a schematic sectional view in the transverse direction of the further alternative length adjustment device 72c in the decoupled state 68c along the line in the

[0076] Fig. 7The indicated cutting axis I intersects the alternative length adjustment device 72c in the area of ​​the coupling recess 38c. The positive locking element 32c is partially located in the coupling recess 38c of the locking element 44c and partially in the fixing recess 96c of the guide element 36c. The positive locking element 32c adheres magnetically to the permanent magnet element 100c of the locking element 44c. If a stop element 16c were inserted, the positive locking element 32c would not be able to exert a fixing effect on the stop element 16c. If the locking element 44c were rotated along the circumferential direction 98c, the positive locking element 32c would be led out of the coupling recess 38c and clamped in the space formed by the fixing recess 96c between the stop element 16c and the locking element 44c.

[0077] The Figure 11shows a schematic sectional view in the transverse direction of the further alternative length adjustment device 72c in the decoupled state 68c along the line in the Fig. 7 The indicated cutting axis II lies below cutting axis I. Cutting axis II intersects the further alternative length adjustment device 72c in the area of ​​the fixing recess 96c below the coupling recess 38c. The further alternative length adjustment device 72c has a rotation limiting device 104c. The rotation limiting device 104c limits the relative rotation between the locking element 44c and the guide element 36c to approximately 150°. Larger or smaller limited rotation angle ranges or an unlimited rotation angle range are of course conceivable. In the illustrated case, the rotation limiting device 104c comprises a pin associated with the locking element 44c, which can be moved back and forth in a groove of the guide element 36c between two end stops. Reference sign

[0078] 10 Tool 62 Procedure step 12 Tool holder opening 64 Procedure step 14 Tool holder 66 Handling robots 16 Stop element 68 decoupled 18 Longitudinal position 70 coupled 20 Stop mounting element 72 Length adjustment device 22 Coupling unit 74 chamfer 24 Change position 76 drive unit 26 Fixing position 78 Tool clamping device 28 Longitudinal axis 80 transverse extension 30 transverse extension 82 Tower 32 Positive locking element 84 base frame 34 coupling recess 86 Induction coil 36 Guide element 88 rail 38 coupling trough 90 admission exemption 40 Coupling direction 92 Base pole 42 admission exemption 94 Magnetic element 44 Locking element 96 Fixing recess 46 reset element 98 Circumferential direction 48 End area 100 Permanent magnet element 50 Intervention recess 102 Pin 52 Positive locking element 104 Rotation limiter 54 Ball cap 106 insertion opening 56 Procedure step 108 Introduction phase 58 Procedure step I Intersection axis 60 Procedure step II Intersection axis

Claims

1. Length-adjustment device (72a; 72b; 72c) for an adjustment of a longitudinal position (18a; 18b; 18c) of a tool (10a; 10b; 10c) in a tool-receiving opening (12a; 12b; 12c) of a tool holder (14a; 14b; 14c), with at least one exchangeable stop element (16a; 16b; 16c) for a mechanical fixing of the longitudinal position (18a; 18b; 18c) of the tool (10a; 10b; 10c) in the tool-receiving opening (12a; 12b; 12c), with a stop receiving element (20a; 20b; 20c), supported in a longitudinally movable manner, for receiving the stop element (16a; 16b; 16c), in particular by means of a receiving recess (42a; 42b) which partially accommodates the stop element (16a; 16b) or by means of a magnet element (94c) which exerts an attracting magnetic force onto the stop element (16c), and with a coupling unit (22a; 22b; 22c) configured for an, in particular at least substantially free-of-play, releasable coupling between the stop element (16a; 16b; 16c) and the stop receiving element (20a; 20b; 20c) along a longitudinal axis (28a; 28b; 28c) of the length-adjustment device (72a; 72b; 72c), characterized in that the coupling unit (22a; 22b; 22c) has an exchange position (24a; 24b; 24c), in which a removal and an insertion of the stop element (16a; 16b; 16c) for creating or releasing the coupling between the stop element (16a; 16b; 16c) and the stop receiving element (20a; 20b; 20c) is enabled, and has a fixing position (26a; 26b), in which the stop element (16a; 16b; 16c) and the stop receiving element (20a, 20b; 20c) are fixedly coupled with each other, wherein the exchange position (24a; 24b, 24c) is positionally fixed along the longitudinal axis (28a; 28b; 28c) and wherein the fixing position (26a; 26b; 26c, 26'c) is displaceable along the longitudinal axis (28a; 28b; 28c).

2. Length-adjustment device (72a; 72b) according to claim 1, characterized in that all possible fixing positions (26a; 26b) are arranged along the longitudinal axis (28a; 28b) completely below the exchange position (24a; 24b), and / or that the coupling unit (22a; 22b) is configured to create a form-fitting coupling between the stop element (16a; 16b) and the stop receiving element (20a; 20b) when the stop element (16a; 16b) is inserted into the stop receiving element (20a; 20b) along the longitudinal axis (28a; 28b).

3. Length-adjustment device (72c) according to claim 1, characterized in that one of several possible fixing positions (26c, 26'c) is arranged along the longitudinal axis (28c) in a position that is identical to the exchange position (24c) and / or that the length-adjustment device (72c) has a guide element (36c), which is configured at least for guiding a longitudinal movement of the stop receiving element (20c), the coupling unit (22c) being configured for creating a coupling between the stop element (16c) and the guide element (36c).

4. Length-adjustment device (72a; 72b; 72c) according to any one of the preceding claims, characterized in that the coupling unit (22a; 22b; 22c) has a maximal transverse extent (30a; 30b; 20c) of at most 1.5 times, preferably at most 1.25 times, a maximal transverse extent (80a; 80b; 80c) of the stop element (16a; 16b; 16c), and / or of at most 8 mm.

5. Length-adjustment device (72a; 72b; 72c) according to any one of the preceding claims, characterized in that the coupling unit (22a; 22b; 22c) comprises at least one form-fitting element (32a; 32b; 32c), which is realized separately from the stop element (16a; 16b; 16c) and separately from the stop receiving element (20a; 20b; 20c) and is configured at least for creating a form-fitting connection for an at least partially form-fitting coupling between the stop element (16a; 16b; 16c) and the stop receiving element (20a; 20b; 20c), wherein the form-fitting element (32a; 32b; 32c) is preferably realized as a ball or as a spring hook, and / or wherein the stop receiving element (20a; 20b) preferably has at least one coupling recess (34a; 34b) for at least partially receiving the form-fitting element (32a; 32b), in particular in a coupled state and in an uncoupled state (68a; 68b; 70a; 70b) of the coupling unit (22a; 22b)..

6. Length-adjustment device (72a; 72b; 72c) according to any one of the preceding claims, characterized by a guide element (36a; 36b; 36c) configured for guiding a longitudinal movement and / or a rotational movement of the stop receiving element (20a; 20b; 20c), and / or characterized in that the stop receiving element (20a; 20b) and / or a base rod (92c) that supports the stop receiving element (20c) is supported so as to be rotationally movable.

7. Length-adjustment device (72c) according to claims 5 and 6, characterized in that the guide element (36c) has a fixing recess (96c), which extends along the longitudinal axis (28c) and in which the form-fitting element (32c) is axially movable when the instantaneous fixing position (26c, 26'c) is displaced, and / or that the guide element (36a; 36b) or the rotationally-movably supported closure element (44c) comprises a coupling hollow (38a; 38b; 38c), which is in particular situated radially inside and which allows an at least temporary evasion of the form-fitting element (32a; 32b; 32c) at least during a coupling-in and / or an uncoupling of the stop element (16a; 16b; 16c), in particular with the stop receiving element (20a; 20b; 20c), wherein the coupling hollow (38a; 38b; 38c) is preferably realized so as to taper obliquely at least in a coupling-in direction (40a; 40b; 40c) or at least in a circumferential direction (98c).

8. Length-adjustment device (72a; 72b; 72c) according to any one of the preceding claims, characterized by a closure element (44a; 44b) which is supported so as to be longitudinally movable in a receiving recess (42a; 42b) of the stop receiving element (20a; 20b), or by a closure element (44c) which is supported so as to be rotationally movable around a guide element (36c) of the length-adjustment device (72c), wherein the guide element (32c) is configured at least for guiding a longitudinal movement of the stop receiving element (20c).

9. Length-adjustment device (72c) according to claim 7, characterized in that the coupling hollow (38c) is arranged in the rotationally-movably supported closure element (44c) in such a way that it can optionally be brought into an at least partial overlap with a fixing recess (96c) of the guide element (36c) by a rotational movement of the closure element (44c).

10. Length-adjustment device (72a; 72b; 72c) according to claim 5, characterized in that the closure element (44a; 44b; 44c) is configured, in an uncoupled state (68a; 68b; 68c), to position the form-fitting element (32a; 32b; 32c) in a loss-proof manner, wherein preferably the closure element (44c) comprises a permanent magnet element (100c) configured for the loss-proof positioning of the form-fitting element (32c) in the uncoupled state (68c) and / or that the closure element (44a; 44b; 44c) is configured, during a coupling-in process between the stop element (16a; 16b; 16c) and the stop receiving element (20a; 20b; 20c), to release the form-fitting element (32a; 32b; 32c) for an engagement with the stop element (16a; 16b; 16c) such that an at least partially form-fitting coupling is created.

11. Length-adjustment device (72a; 72b; 72c) at least according to claim 5, characterized by a reset element (46a; 46b; 46c), which is at least configured, during an uncoupling process, to reset the form-fitting element (32a; 32b), in particular by means of the closure element (44a; 44b), and / or to reset the stop receiving element (20c) into an initial position ready for coupling-in, wherein preferably the reset element (46a; 46b; 46c) is realized as a compression spring which is supported at an end region (48a; 48b; 48c) of a receiving recess (42a; 42b) of the stop receiving element (20a; 20b) and / or at an end region (48a; 48b; 48c) of a receiving recess (90c) of a base rod (92c) that supports the stop receiving element (20c), and / or that the stop element (16a; 16b; 16c) comprises at least one engagement hollow (50a; 50b; 50c), which is configured to bring about an engagement with the form-fitting element (32a; 32b; 32c) in order to create the form-fitting connection between the stop element (16a; 16b; 16c) and the stop receiving element (20a; 20b) or the guide element (36c).

12. Length-adjustment device (72a; 72b) according to any one of the preceding claims, characterized in that the stop element (16a; 16b) comprises at least one further form-fitting element (52a; 52b) configured to receive a torque from the stop receiving element (20a; 20b) and / or to transmit a torque to the stop receiving element (20a; 20b), and / or that the stop element (16a; 16b; 16c) has a spherical cap (54a; 54b; 54c) on an end facing towards the stop receiving element (20a; 20b; 20c).

13. Tool clamping apparatus (78a; 78b; 78c), in particular shrink-clamping apparatus, with a length-adjustment device (72a; 72b; 72c) according to any one of the preceding claims.

14. System with a tool clamping apparatus (78a; 78b; 78c) according to claim 13 and with a handling robot (66a; 66b; 66c), characterized in that the handling robot (66a; 66b; 66c) is configured for an automated exchange of the stop element (16a; 16b; 16c), in particular by means of a purely linear movement.

15. Method for coupling a stop element (16a; 16b; 16c) with a stop receiving element (20a; 20b; 20c) in a length-adjustment device (72a; 72b; 72c) according to one of claims 1 to 12, wherein preferably the stop element (16a; 16b) and the stop receiving element (20a; 20b) are in a coupling step coupled at a positionally fixed exchange position (24a; 24b) that is situated above all fixing positions (26a; 26b) in which the stop element (16a; 16b) and the stop receiving element (20a; 20b) are connected with each other such that they are not separable without destruction, or the stop element (16c) and the stop receiving element (20c) are in a coupling step coupled at a positionally fixed exchange position (24c) that is situated axially in a position identical to one of several different fixing positions (26c, 26'c) in which the stop element (16c) and a guide element (36c), which is configured at least for guiding a longitudinal movement of the stop receiving element (20c), are connected with each other such that they are not separable without destruction.